Tilemap only renders if gfx_tilemap_t is local

[mateoconlechuga]

Tilemap isn't rendered if global scope. wtf.

[mateoconlechuga]

This is caused by not zeroing the upper byte of BC, which is masked by using a local... Silly Mateo. Will fix and update in next release.

[mateoconlechuga]

Fixed with 7d3e9d7